I think that you're the first to use a 3G SIM and try to reactivate. If you paid the subsidized pricing, you're stuck on the $30 data plan for the next two years.
really? have you read this thread at all
my account now says $20 iphone data+200 text
iphone restored now running my original iphone on 2.0 back on $20 plan and have the tms4 code for 250 extra texts at 3.99 and u200 code for 200 bonus minutes still on my account